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Definition of fluid ounce noun from the Oxford Advanced Learner's Dictionary

fluid ounce

noun
 
/ˌfluːɪd ˈaʊns/
 
/ˌfluːɪd ˈaʊns/
(abbreviation fl oz)
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  1. a unit for measuring liquids, equal to 0.028 of a litre in the UK and some other countries, and 0.03 of a litre in the US. There are 20 fluid ounces in a British pint and 16 in an American pint.Topics Maths and measurementc2
See fluid ounce in the Oxford Advanced American Dictionary
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